Concave three-sided nail file



FIG. 1 is a perspective view primarily showing a first concave side with coarse grit pattern.

FIG. 2 is a perspective view primarily showing a second concave side with medium grit pattern.

FIG. 3 is a perspective view primarily showing a third concave side with fine grit pattern.

FIG. 4 is a perspective view showing concave sides each with coarse and medium grit patterns; and,

FIG. 5 is a top view of the concave three-sided nail file. 

CLAIM The ornamental design for a concave, three-sided nail file, as shown and described. 